Mathematics, 25.06.2019 10:30 BrezzyGirl9148

Which equation can be used to solve for the rate, r, for sam to change all the light bulbs in the office building by himself?

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Answer from: brillamontijo

$\frac{3}{8}+\frac{3}{r}=1$

Step-by-step explanation:

The complete question is

Working together, sam and charlie can change all the light bulbs in the office building in 3 hours. It would have taken charlie 8 hours to do the job alone. Which equation can be used to solve for the rate, r, for sam to change all the light bulbs in the office building by himself?

The finished work is represented by 1, which means the 100% of all.

Also, the ratio for charlie to do the job alone is

$\frac{3}{8}$ , which means that he take 8 hours by himself, and 3 hours together.

The ratio for sam to change all the light bulbs is

$\frac{3}{r}$ , which means that he and charlie take 3 hours to do all the job, and represents the time is can do the job alone.

The sum of these ratios must be equal to 1, as we said before, represents 100% of the job done.

Therefore, the final expression is

$\frac{3}{8}+\frac{3}{r}=1$

Answer from: Quest

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post
Can someone plz me 1 to 37 . i will earn 10 points

Can someone plz me 1 to 37 . i will earn 10 points

Answer from: Quest

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!

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Which equation can be used to solve for the rate, r, for sam to change all the light bulbs in the of...

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